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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bdf9f8b3b3ebed4e81837ea39b0813fcc4591dedfa60a2716489d7975f3ce73' 
  AND token = 'hvIHaLseGdHmgK5y55PEvLUbaxl7u0pHu5KyBde+ctQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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