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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd24eb6ac6aaf749083f54ff998cefe271393c9e69369b3d8a838768db4ae9ce' 
  AND token = 'rMxEldPn1wYlqZerSLlC7fo76Apb+1vx3VFa+35J0vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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