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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd834901dc72cd735119b5e06db87df1f2857428f74c32f34c887d1f229dc09db' 
  AND token = 'Y319J+PB0ZCQ6RG/Ex05D2F0v89t49g1cWUGmfcQ8bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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