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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcdb6853e12d356243499d97472dc3841d8d0d9b400482d0e079095c328eb665' 
  AND token = 'R1PCestm5i9M9ktXTujTCRFwoHX3afFddB/Del6tEso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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