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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d83cacff09b46f91b16e8f75f6baab17bef7664ef13c16856120f1f797dcc5' 
  AND token = 'zb1G2rSLwQFVHH6u9bs4ZtlUyxACW1VKw1d486jeAVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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