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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2df4a878987de700bb8ae12d5b297f881687492c70c6cd7fcfaa457a05e49a0' 
  AND token = 'srcoihoesf/Qj84+jA+h2Vg16A4MEpWzEf8mZD4AFBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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