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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d4a3e9d4250061cfa29dff4ff4a89e44310eb70dfac9376ef9586c9e8521e25' 
  AND token = 'pMaoAjVGoatjLXJWKLjIid+zfTQIBwJceHLbExYI7lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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