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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62db58b09d00f0d79697bdcfcd9071a1e0e00f53d0ef0e0b5f80bcbffafa536f' 
  AND token = '2RSgHIMkVHG7ZtTletRYlWQ4MTirbCA/9K3WsXoBAdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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