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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a0772041b0e8ff6f329f3970a4d8346fe63affd515b818e0c327025a9ce840' 
  AND token = '0oiE0o/ekYTtIUinjVG7PM+yfR03bCp2LDlKyZMdyQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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