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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd86c2079d2b6da83d5d4a051077981b1e6d825f69653d4043a110fe36628636' 
  AND token = 'xTYpYY0APBIFCtKU64NQ4bVoiC1pD4tiwrGms0o7Z5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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