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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576e04cf096a7fba04531de4d30988cb1b5433f58e9f64487c315cefbba1a0b2' 
  AND token = '7kLcD8sUN16TzXlJHG7P7If13XFTfASpBiIZRK0JX/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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