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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1193d170d97cb59b5711edf505ee00317d7a2dc269a2f8e52d50bba0033f1e26' 
  AND token = 'j2sZBuyOyk7T4361fnWv+p0rkDiYtG4jitLXaV9cFl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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