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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb030cb9a85ec5c6026a6fd5dbf4ffff09d16f69331a4d44ed0f4990b3628f31' 
  AND token = 'M83DWB3G/9Ot3rccN2Wbh0DAYOC+h/jUdD0T7Z5Pu6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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