SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce2c38bb35f84446d757c2e240ad9a4ce148237f9efac2bbdb9268d25a16cd3' 
  AND token = 'fPHv8HjH3JmIgOAasOiX9UzsVSKZUBp53Zipv69JLzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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