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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896873aa0e660c13ed258268249100468508a1f6b0335bfc3467ebc9e8673176' 
  AND token = 'xRAhs66Kna3iHgs89J62efdNpKRX01I2ib0OC/QsuWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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