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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb7da1aeca3d6902b1dc437533369501140b661a11229703700d40f93b772726' 
  AND token = 'qsYl+zDcirkFEYX5LnmQfxMk0Ydd7ewTOxSQNqe1w88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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