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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f727faf5dc750de9334964a3f1a29f0c98e8c342100afc645a8aceb71b10ff' 
  AND token = '9WzsDns3xOwKSv/q1M3lq1IHPWvHXdZQVP3uV4rnWiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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