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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb15865d9c31e46ec098013ae92d5fa970994ed6fb017bd339c61390228babfe' 
  AND token = 'qzIQXac2l2+EtISfZ3dzCDMNdpYQXILL4e/da9/zoBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}