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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2713017cb8fbf7a10e1e87d2b58c91ef1139404583167659d1884616e686ad71' 
  AND token = 'K7k9m/JY6a7ORzVzJyUXFBA9mMqGs7wVaSsxO2bdAco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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