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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4452bf029de9b6f8ce51ca2a7bbe98cc2eb17c48683e606e336ea95f17ba943' 
  AND token = 'wjoBsig4tISyjbxe+8pnGtVC7xWwRubN5kMl73rzq9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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