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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c680788b95ddb2e958c2a9d25f543759685a1929c7feaa273cd4e31da98d1654' 
  AND token = '/q9lITIMXU2+Ci5brzsU0emmQIv3QMBwpqTLsbrLYxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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