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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c930fe3dd9062b2011f66a9d365a2b83c1e574979e8c49ecebffc8a2245bd45' 
  AND token = 'eDIWEIDg2qobhjf6y8j1ZtKZpl4in8V/Y9x3IS36UKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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