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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2835a785e0cc3035b40429f3a80cb66f6b56a5e3ebf3afb0fbc0a8f37e968c74' 
  AND token = 'meGxKRMUEzFmFv6mvkzaP0dP+fsMDR35lGg3LbuVI44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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