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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47437b8c3f6addd618a9bed551a3b33e5a2183c9658b20cacbc7e2ee9494615' 
  AND token = 'oLK11V1pm2+IoZ+/JuMtSoQbSfL6sENw7M7iBrmHjnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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