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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db979141f761e4c5d970ea41b3599f941354a8953f3fad862f1dffe289c46b6c' 
  AND token = '5uDRgbid6E63J+C3LVyjGYZu7hYECYAIG4tnIBS7cbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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