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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dae60f7ee332ac947c72e4b4a8b993887fd563ab16fa4767600f4986e742053' 
  AND token = 'pVtMzHKV0s3S39y8n6M4sywjtkLyd75ZCwzEH+8uC+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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