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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c670a9a26b3012061af09058891614393dd576ac01fb10d35345e3781bb9b8' 
  AND token = 'bAJxOBvEzyeFHCEWXbDA4Or7szNMtHKggL1jhnQ9jyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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