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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac550a282be5067b56d902e68de7cf4e664179d7b08bf9fc654f89cb7d4748ee' 
  AND token = 'P/QBp6GZqypMKnoBNxta6eM0hVhaB2k/1b71iL3NEec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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