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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eec0e73fd4f029809ecee11bcf3f87cb209435e2a665a72dd5ea224f4b1c5f5' 
  AND token = 'H1P9Dh2q0Q5g7s0HxSjV20p4f/P7JipocmYHzYai3Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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