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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c2c87eb50274f80515c57d0699c42e73517901b9b4eaac24fbf55323951918' 
  AND token = 'aF11PTQVyso0FKcLE/qYjlFD6+XUc59E+0UL2Vv4K7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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