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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7553636f0cf236666df3c8aaa216f15b426d39ce7740c15f8172dfb53b4061fa' 
  AND token = 'fKbiIUjPEXKG7J5Y34Kn8EHhdKg8K69Z6S7IEsxiGwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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