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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb32692287c9b64bc2aaf02f93c0115498b9b50d5634f4a7d8fcda48c54cbee' 
  AND token = '2XnUeq7YzQbE8f2faJ7KxX4ixvL+ifM2TY0f9jUSdn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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