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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6c6abfee6b8c56175662d5153a7a33e3aec448e2ccff1563fac5e6d9c1cb46' 
  AND token = 'gGdALG6GwxXpq4Aw6uBB16oGkuQrgODqRyVcxvSLsRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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