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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44cc6faaf1c9fa259ed47466bf9a1da59ddfd303b2210a60218eadc85d59116e' 
  AND token = 'ofYDoklKuTz4w+tze0sEky4+3TaoIbczsl9xvo0RtFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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