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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d145d3d2dd9ab6a71464a234e938dc3bb89b50be44750cd567b3e8deea5c7a8' 
  AND token = 'FOTBorxXIKQKelMMKHxt0FeveVg4XUc9UV9aXEMuI/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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