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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097d74d67fd9f147b5b96864e474ac2710325e18a94e023dcd1642121ce0f646' 
  AND token = 'jIq5B5joHM6VoSRcCGig14avd80MAREdwRmLDzJbM1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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