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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4061f3176670b3d5d874f4ae23d1c3b616ac45d4bb7198c5bd2a3510ad8bf66d' 
  AND token = 'XKtx4SJ4MI3AYaZAsqU8zEq5aEbnmEtxO88e5L/quq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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