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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c23c5cd49563054cca3f9212157f326374ef91f412361fe26f3ca93bb845ae52' 
  AND token = '9mN693a7s1Tz/laNa62IJmk1xPBzrZVHr3EoRuwadWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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