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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdbb6bef2957c40feeda47e1a05de8fa58f6706b0aed092b0b0204b2b56dc2e1' 
  AND token = 'yzdiGYmQ9KY+JROuyEywOoErH9FFyORm9K6954pu32I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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