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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '296eb49f1283f4b97c69f07fdec1625de0cfd532584c2fe6f9ffa45c1b2e8952' 
  AND token = 'UIAVc4aauUHlqih6JSQAym7Re2D0nyx8i0Srcw9ctu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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