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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '051aea5afe35de3b2049fafe1ed293f9bf2aa82bb9450dc4c24aff30ce9fd5b9' 
  AND token = 'VqKSb/tIPagfDyCzvuHHuBfcs0ajPA20hWzU/hTxMRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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