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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ee77fac3fafdffa6a076bf9b2040ac7b5249400cc1abf342bf5acef52589fb' 
  AND token = 'x9apoRvBz7vlZAn4Ky4S4oQbE+qY4QEUQ5NQDPOWVNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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