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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9832878084fba2796aa0ccc262d9d4b30327f269a007d6f7b9e1a1f19103cc42' 
  AND token = 'ShNTpvNxGhaYKP8UtfdpFKTUjewycHj3qsYQyrRckR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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