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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600c36b98047b7edb12db7701fdb522d0509e3a3f54550811275db554e08d016' 
  AND token = 'TklYfZrkx7UZoEEe24Jac79Rj5hJ3kX29taKbw7NLWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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