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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37e32c73feb6d345a25524fe98dd659b7ac0a4234da3f156382a361f405c4e8' 
  AND token = 'vElcXmvqpdKjz8moLJI26j1w41keu4ymzwOMEnFWi9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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