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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc6bc355f9a2e49617205067c812605f595af430e630a91d30128184c968159' 
  AND token = '2C+rsmL+WcwjlCD/QOFyFxEB0KIQCv3Ig5LQ6kxpLfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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