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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a0b8a3202ec99abbc2f75d333a3058338ff1c62becb8c20140327b5e48464d' 
  AND token = 'QGV5QJQ9jtoENc+bR7GW5scvEmtobjeoxR2xXqr4UvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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