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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd96f6b2f5e169f6e7efe0fb91e3c57ed7646296b0f7c5a01d38f84be4c89dab' 
  AND token = 'IfqGo5jsYd5TARHPNftlHrzGjaIuG3ItSXSLdkuriAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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