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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1caa05959ad835ea7645be6cc35fba7b4c52945d7d33c2b6fc536ed3de51bad' 
  AND token = 'QZ/yVwI0UqdefGQZUYU/At3Nt2f1kSUQftGGNv8kbaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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