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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86bec2aa3eb1d1489475cf0089fa69f174e2fae0074a8571393a3d4f4103fa8' 
  AND token = 'T4EcOEuLDJ8/r6qNMPFJyU5Q8/W0dbgm17y+LozQros=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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