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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d609f74f76af326e7c9398f17e78e4388129042d1e4aeef56a79e8364be9d39' 
  AND token = 'NFTBNPZBcHSucptr3+aBYlDZe5PM4bp/qO+lHbTLE80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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