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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '435814122da32ee5af7d5216de32f6fcdc0d93203b7794b61b6bb0c37de05f6f' 
  AND token = 'Miln5kZD5Wux0Klq34ynRpUmTXGlxqpoZc/kZcKR6Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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