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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0a0d9bfa24a2645668671ddb988c31b24cd042cf2b01fe9426e44944d93bf5' 
  AND token = 'K1rur/lVggffZ1FeaecHGzVaiF4vvqfGR7pnPe79aW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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