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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61a76627da90834969e3d7f1cbe5f115f673b849e78642963069aa3e3a659350' 
  AND token = '03YehhpW6588RfgetPH+KQse3BORP5aFut2Wxz0w1ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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