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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b90e2d638399f3c6d4a1faa4171f7c7f3a6caca4c444648df8f7ee944fe771f' 
  AND token = '9Z0AEIRjrqPL/37CMAIlr6qgoO268RrL+s4HE03pgig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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