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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a534a7b1a90c0d0acd9cc67be03ef41e4d9c3a7c3aaa7c0eb3a5ec6c6afdfbc0' 
  AND token = 'zcAhFKy6jFpoEpELYPbeQkDLQf0RPeJXa+ADQ1XHHkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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