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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a9144df4b64fa813667f09a4412eb59c344a1eb8622fb7f892f88e5cfa3a4c' 
  AND token = '2qS/Ysx/EfI8vx/l6f3WHLkzx2kIXzFozLG9pgX1Ppk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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