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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57796fb00a380494284383576bb50e1dec77af5671c66ae584c2e11f9a5d3ada' 
  AND token = 'Mvzp/TWIUct8clq66Wl7UnjOGLJVNHCb/9eH8OK5ap0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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