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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14c47d135d6c11d505d8ddb478758687ba4e23345263ee52668a94d48715a9d8' 
  AND token = '8VL6IiSjO/CbGzex2cW/K7Z2XrlG26hg/v+97ayLjEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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