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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '388a607dd3608f8c0c9aadb3223f1433f8809d8cd8fc2da73d0971185ffaa361' 
  AND token = 'dWzWr3C/wt7w81inZcrR+bDYyYbndhv7mQ26gFM7jlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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