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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd4cd909bf579568690a0f620d0d4ad7c77c49068432d9b6eb64ccbee616c26' 
  AND token = 'Q/ezU9aBZCR9YiIYde2oRf4/8/BjFjoQVFz51SGo4/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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