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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d56de9fbfaf174017eeb62912f3a121444d4dd310e92b243deb4a9d31847655' 
  AND token = 'ILfaIr6JOpGjf4a2jnuoYL7f1oAb1/D+Np4PoGzOEgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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