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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67428a503c62dd676e34d6b243e5a13cc1380af4de1f6f6dfc66b7dcdbf6ffc9' 
  AND token = 'jaUHPww1ZP3+gC4l7KdO9SnnwWYNgbwarhJPdrSGvMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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