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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db2d8558e2c1ad59798658cc8aeb0c75eee95862f47e82e11a6221c475cf846' 
  AND token = 'BCU76jTjqqxMSg9hEg0d1JX4Hh6Dvw8svTQ+BjstR60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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