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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '754f6092edde6372d57ee2c7b31dd1009ddda4166e1af1fa4f76dd8a6e8b3ca1' 
  AND token = 'li7kepPRVW0TObtX3mP3Gjhi9a41ucG9tVdpl5KxmhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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