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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e4a9c05f9c858ef1984502a7a96f8121322673fc27f51009d65aa8b6026cdbf' 
  AND token = 'H0Bi4kMpwSMnmuf/jNz2KH10QjUMaoPNl7BlAafJR6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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