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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b7c56dc40493ebc9b43d2e4cf70d805ffd0098a1af5e86673f702b1cf8fe147' 
  AND token = 'g6dzsMH2jQm76rHOMLAoCYHxD+qQJ5zxL68Iwr7fG5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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