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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94131089ea4a8eeecaffffa40621e995e2781dc034ebfbf488b38a24c66fad72' 
  AND token = '3vCIu2lgC8kxqH8pRmvldy70oM+uKbZFDlk5xPtIjdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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