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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8a907f0b2e56f6ea6a155cd39378a4d54a7cea05a7fdf8cdcfc5ab99b45b58' 
  AND token = 's9h2rB6R9MadYvm8mwikLIWM/GuBAVeo7ZWTOJQcAcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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