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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52088dda27dad58de331c7e8f6fb76d9b9c310abd81ca534352aaea446b3db73' 
  AND token = 'yGdjP8ceij54OnZ105nj7Q/IvXbOsXwsJV5ppl9uCHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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